docs: def add_encrypt_chunk(self, local_file, offsets, symkey, iv):  # noqa
          # type: (CryptoOffload, pathlib.Path, blobxfer.models.upload.Offsets,
          #        bytes, bytes) -> None
          """Add a chunk to encrypt
          :param CryptoOffload self: this
          :param pathlib.Path local_file: local file
          :param blobxfer.models.upload.Offsets offsets: offsets
          :param bytes symkey: symmetric key
          :param bytes iv: initialization vector
          """
          self._task_queue.put(
              (CryptoAction.Encrypt, str(local_file), offsets, symkey, iv)
          )